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Inputting Character Strings
Section 7-15
7-15-4 Screen Saver Function
The NT31/NT31C has a function to maximize the service lifeof thebacklight andto
prevent the formation of an afterimage by turning off the screen display and the
backlight if no operation is performed for a certain period of time.
If the same data is displayed for a long time (about 24 hours), an afterimage will
form on the screen. Toprevent this, either usethescreen saver function orperiodi-
cally switch the screen.
There are the following two types of screen saver function.
S Screen saver that turns off the screen and the backlight
S Screen saver that displays the contents of character string memory table No. 0
for a set length of time each at random positions on the screen (with the NT31C,
the color is also changed randomly). With this screen saver, the backlight is not
turned off.
Note
Do not press touch switches carelessly while the backlight is off or while nothing is
displayed on the screen.
Confirm system safety before pressing touch switches.
Notice
After images may remainif the same pattern is displayed for along period (approx.
24 hours).
To prevent the formation of an afterimage, either use the screen saver function or
periodically switch screens.
Reference:
It is also possible to start the screen saver function using bit 15 (screen display) of
the PT status control bits.
Redisplaying a Cleared Screen
When a screen has been cleared due to activation of the screen saver function,
this screen can be redisplayed by pressing an NT31/NT31C touch switch, or by a
screen switching instruction from the host (if the backlight is off, it is also turned
back on). The screen will not be redisplayed when display contents such as nu-
meric values or character strings are changed.
Setting the Screen Saver Function
Whether or not the screen saver function is used and, if it is used, the waiting time
for execution, is set with the memory switches of the NT31/NT31C.
For details on the setting method, refer to 6-9-7 “Setting “Screen Saver Move-
ment” (page 197) and 6-9-8 “Setting the Screen Saver Start-up Time” (page 199).
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